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John Fulton

John Fulton
Former County Extension Director

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In The Backyard

Horticulture columns and tips done on a timely basis
fall webworm

Fall Webworms - in June

Posted by John Fulton -

This is one of those years where it looks like we will have two generations of the fall webworm. Fall webworms live inside a "web" all the time. They actually expand the webbing as they need to have more leaves to eat. They are usually worst on fruit and nut trees. You can even clip the nest (and the branch it is around) off the tree and burn it. I guess this tells you that defoliation caused by the insect isn't that great of a threat to the tree or you wouldn't cut the branch area off. If you want to spray fall webworms, you need to get the spray through the web. This may be a little harder than you think. If you don't have enough pressure, the spray just runs off the webbing.

When we talk about controls of the larvae, the fact that they are larvae of moths or butterflies makes them susceptible to the use of B.t. products such as Thuricide. Other control options include the standbys such as Sevin, Othene, malathion, and the synthetic pyrethroids such as bifenthrin and permethrin among others.

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